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Old 07-07-2003, 12:02 PM   #1
Zen
Scooby Newbie
 
Member#: 12656
Join Date: Nov 2001
Location: Toronto "spd frk"
Default Oil Level and Pressure..

Hi all,
I just want to find out if I'm not alone with these things,
I bought my car not too long ago and my mechanic changed the oil to synthetic. I usually do my own work so I have peace of mind. (This is probably why I'm stressing) Well anyways, I checked the oil on the dipstick of course and the readings were inconsistent. It does seem a little high though. I did a search and I know I'm not the only one with this little annoyance. I also have an oil pressure guage and usually when I start the car up, it's sitting anywhere from ~75-100psi. I always let the idle settle down to normal before I drive off.. After driving a while and then letting it idle, the pressure goes down to 25psi. As per my search I also found out that these engines are capable of pumping over 100psi. I just wanna know if I have too much pressure in my crankcase, I surely don't want blowby. Sorry for the length, but I really wanna know if I'm not alone! Thanks all!
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Old 07-08-2003, 06:36 AM   #2
Zen
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Member#: 12656
Join Date: Nov 2001
Location: Toronto "spd frk"
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Old 07-09-2003, 12:10 AM   #3
SubyTechMaster
Scooby Specialist
 
Member#: 4423
Join Date: Feb 2001
Location: Placerville, CA USA
Vehicle:
'04 08 Tribeca, SVX
Gold, Maroon

Default

The oil on the Dipstick will read consistantly if it is checked consistantly -
allow the engine to rest w/o running for a few minutes (the longer the better) with the vehicle parked on a level surface. Extract the Dipstick, wipe it clean, reinsert , repeat
If the Dipstick is extracted and inserted in the same position it will read the same.

BLOWBY is a factor of exhaust gas getting past the rings into the Crankcase. It has nothing to do with Oil Pressure. Crankcase Pressure is kept at minimum by the Positive Crankcase Ventilation system (PCV).

Oil Pressure is primarily affected by clearances in the Oil Passages and bearings of the motor (resistance), it will vary with temp., viscosity, pump head pressure. The Oil Pump Relief Valve in your motor opens at 117psi so this is the maximum pressure you should see with a gauge. When the oil is at operating temp and the engine is idleing 25 psi is acceptable.
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